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What are the meanings and uses of VB, VW and VD in Siemens plc?
These are representations of different data types in the V register.

In Siemens PLC: VB stands for a byte in the V storage area, which can be used to store short integer data.

VW stands for a word in the V storage area, which can be used to store integer data.

VD stands for double words in V storage area, which can be used to store double integers and floating-point data.

Siemens PLC is a programmable controller produced by Siemens in Germany. Its products include LOGO, S7-200, S7- 1200, S7-300, S7-400, etc. It has the characteristics of small size, high speed and standardization. PLC can be divided into micro PLC (such as S7-200) to meet the requirements of small-scale performance. PLC adopts ladder diagram, Boolean mnemonic, function diagram, function module and sentence description programming language, which does not need a large number of moving parts and connecting electronic components, and has the advantages of simple programming, strong operability, automatic diagnosis and easy maintenance.

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